SMA AUTOMATIC SWITCH BOX M-20 - Manual (Page 6)

2 Safety SMA Solar Technology AG
6 AS-BOX-M_L-IA-IEN110320 Installation Guide
2 Safety
2.1 Appropriate usage
The Automatic Switch Box is a switching unit for Backup systems. The Sunny Backup regulates and
controls the Automatic Switch Box and forms a stand-alone grid in case of a power outage. During a
grid failure, the Automatic Switch Box safely disconnects the connected PV plant and the connected
loads from the power distribution grid and connects them to the stand-alone grid.
In case you ordered the Automatic Switch Box with generator connection, you can include a
generator into your Backup system. If a generator is included into the Backup system, it can be
connected to the stand-alone grid via the Automatic Switch Box in case of a grid failure, if required.
The Automatic Switch Box M-20 and the Automatic Switch Box L-20 are both suited for TT systems
and TN systems.
You may operate the Automatic Switch Box M-20 only in combination with a Sunny Backup 5000
and the Automatic Switch Box L-20 only in combination with 3 Sunny Backup 5000. In a 3-phase
Backup system you must configure one of the 3 Sunny Backup systems as a master and the other 2
as slave. The Sunny Backup master evaluates the data recorded in the Automatic Switch Box,
coordinates all switching operations and controls all components of the Backup system. You will find
further information in the Sunny Backup 5000 manual.
Do not exceed the maximum connection power of the individual outgoing lines in the
Automatic Switch Box. You will find the maximum connection power in section 10 ”Technical
Data”, page 53.
Do not use the Automatic Switch Box for purposes other than those described here. Alternative uses,
modifications, and the installation of components void the warranty claims and operation permit.
This guide is part of the Automatic Switch Box. Pay attention to all the activities described in this guide.
Keep this guide in a convenient place for future reference.